Meilan Note 3 Replacement Battery 3.85V 4000mAh Li-Polymer

Meilan Note 3 — 3.85V Li-Polymer Replacement Battery

This is a 3.85V, 4000mAh lithium-polymer replacement battery for the Meilan Note 3 smartphone. It replaces a degraded or failed original cell and restores normal phone operation. Capacity figure is taken directly from the product specification: 4000mAh / 15.4Wh.

• Meilan Note 3 fitment: This cell matches the voltage rail, physical footprint (80.60 × 64.50 × 4.50mm), and connector orientation of the Note 3 battery bay. The BMS handshake communicates charge state to the phone's power management IC over the standard two-wire interface used on this platform.
• Bench tested on actual hardware: We cycled the cell through charge and discharge on the Note 3 board. The BMS held charge termination correctly at full capacity, and no thermal cutoff events were triggered across three full cycles from 0 to 100 percent.
• First-cycle fuel gauge recalibration: After fitting this cell, disable fast charging and run one complete discharge-to-charge cycle at standard current. This lets the fuel gauge IC map the new cell's discharge curve before high-current charging pushes current into an uncalibrated state counter.

Why the Note 3 reports wrong battery percentage after a cell swap

The Note 3 uses a coulomb-counting fuel gauge IC that tracks charge by measuring current flow over time. When the original cell is removed, the IC loses its reference point and applies its stored discharge curve to the new cell — which has different impedance characteristics. This mismatch causes the displayed percentage to drift from actual cell voltage, sometimes significantly. One full slow-charge cycle resets the coulomb counter and aligns the reported figure to the real state of charge.

Sudden shutdown at 20–30% on the replacement cell

This happens when the modem or display triggers a high-current draw that the cell cannot sustain at its present voltage level, causing terminal voltage to sag below the BMS cutoff threshold even though the reported percentage looks safe. The fuel gauge IC is still running on stale calibration data from the old cell, so it reports 25% when the actual usable charge is near empty. Run one complete discharge cycle without fast charging — let the phone shut down at 0% naturally — then charge fully to 100%. After that cycle, the percentage reading and actual cell capacity will track together correctly.